Machine for boring out core sand from the bells of cast-iron pipes



Feb. 11, 1930. D. GILES 1,746,346 v v MACHINE FOR BORING-OUT CORE S ANPFROM THE BELLS OF CAST IRON PIPES V Filed May 12. 192s 2 Sheet-Sheet 1INVENTOR r 0/: W0 5 E 3 YM .9

Feb. 11,1930;

I MACHINE FOR BORING-OUT CORE SAND FROM THE BELLS OF CAST IRON PIPESFiled May 12v, 1928 2 Sheets Sheet 2 I ATTORNEY Patented Feb; 11, 1930nm'r ansmrss PATENT OFFICE.

DAVID: GILES, or CHATTANOOGA, TENNEssEE, ASSIGNOR To UNITED sTATEs CASTIRON PIPE & FOUNDRY COMPANY, or BURLINGTON, NEW JERSEY, A CORPORATION OFNEW JERSEY MACHINE FOR BORING OUT CORE SAND FROM THE BELLS OF CAST-IRONPIPES .A pplication filed May 12, 1928. Serial No. 277,232.

My invention relates to mechanism for boring out the core sand whichadheres to the bell end of acast iron pipe after the casting of thepipe. Myinvention has especial reference to centrifugally cast pipe inwhich the only adhering core sand is that left in the bell ofthe pipethough, of course, it is capable of use in connection with pipes,however cast. The object of my invention is to provide a machine forboring out the core sand which will permit of the rapid handling of thepipes while at the same time provide for the correct alignment andsecure holding of the pipe in registry with the bor ing bar.

The nature of my improvements will be best understood as described inconnection with the drawings in which I have illustrated a machineembodying my improvements and in which Figure 1 is a plan view of mymachine, partly sectioned to show a detail of construction.

Figure 2 is a side elevation of the machine showing a pipe in positionwith its bell end shown in section. f

Figure 3 is an elevation, taken as on the line 3-3 of Fig. 2.

Figure 4 is a side elevation of the mechanism for transporting the pipesinto registry with the boring mechanism, showlng also my port indicatedat A The support A carries on its overhanging arm cylinder B and isformed with a guide-way indicated at B in which is longitudinallymovable the squared sleeve D which forms a bearing D for the boring barand is provided on its under side with a rack indicated at D This rackis engaged by a trunnion E on the shaft E which is supported in thehearing D and is turned in either direction by the attached lever armsindicated at E F is a boring bar supported at its rear end in thebearing C in the upright A and supporting the boring head F at its otherend. As shown, the portion F of the boring bar which extends through thesleeve Dis somewhat less in diameter than the rest of the bar and, asshown also, I provide collars f at each end of this reduced portion toform a firm abutment for the sleeve D. The boring tools indicated at Grare convenientlysecured in the boringhead, as indicatedi-n Fig. 7. The

boring bar F is rotated in any convenient way, as shown by gearingindicated at II and H I is a cylinder secured on the base A in alignmentwith the boring bar; I a piston moving'in the'cylinder having a pistonrod I which extends through the head of the cylinder and supports ablock J which is formed in longitudinal grooves indicated at J and withthreaded portions J 2 at the ends of the groove. In these grooves Ilocate the chuck bars indicated at K which are formed in V shapedrows Kthe edges of which are toothed or roughened as indicated. These chuckbars are aligned in the head J by means of the screws indicated at Jscrewing into the threaded portions J at theends of the grooves. Thealignment of the chucks is such, of course, as to bring the pipessupported thereon into proper registry with the boring head. L, L, arero'ds secured to the head J extending down through flanges of thecylinder head and having nuts L screwing on their lower ends which, bycoming in contact with the flanges of the cylinder head arrest theupward motion of the chuck.

M is a cylinder supported 'on the overhanging end of the frame part A Mis a piston moving in this cylinderhaving a piston M to the end of whichis secured the clamping head N, having preferably a toothed surface, asindicated, and located immediately above the chuck; O, O, are sup portsfor the tracks 0 0 provided for the support and transportation of thepipes and O, O, are stops illustrated as slight projections from thetops of the tracks 0 located opposite to each other, one on each trackand so positioned as to rest a pipe in approximate registry with theboring head. P 1s a shaft supported in brackets P P, attached to therails 0 0 having secured to it the lever arms indicated at P P and alsoto lever arm P". Q, is a cylinder; Q a piston moving in the cylinder andhaving a piston rod Q which is connected by a link Q, with a lever armP. R indicates a pipe having a bell end R The 0 eration of the describedmachine is readily Followed. Pipes R are deposited on the tracks 0 and,one by one, rolled forward into contact with the stops 0 thereby cominginto approximate registry with the boring bar. They are brought to anaccurate registr by means of the chucks K which are lifted y thecylinder and piston I, I and which performs the double function oflifting the pipe, if necessary, to proper registry position and b reasonof the V form of the chucks, proper y aligning it with the boring bar.The elevation of the chucks is determined by the stop mechanismprovided, to wit, the adjustable nuts L on the rods L. After theelevation of the chuck, the gripping head N is brought down uponthe topof the pipe by the action of the cylinder and piston M firmly grippingthe pipe between the head and chuck. The operator then, by means of thelever arms E rotates the shaft E so that the pinion E acting'on the rackD will carry the sleeve D, and the boring bar held in it, forward sothat the boring outlets G will ream out the bell end of the pipe. Assoon as this is accomplished, the shaft D is rotated in the oppositedirection, retracting the boring bar. The gripping head and chuck areretracted, leaving the pipe free upon the tracks 0 and the operatorthen, by means of the cylinder and piston Q, Q, and the describedmechanism rotates the shaft P, moving the lever arm P P from itsposition of rest, as indicated in Fig. 4, to the position indicated inFig. 5, the shape of the lever arm being such that its portion P whenthe lever is rocked upward, rotates the pipe to an inclined surfacesothat it will, by its own weight, roll down upon the portion of the trackin the rear of the steps 0 Having now described my invention, what Iclaim as new and desire to secure by Letters Patent, is:

1. A machine for boring outthe core sand from the bells of cast ironpipes comprising in combination a reciprocatable boring bar, avertically movable chuck for supporting and aligning a pipe in registrywith the boring bar, means for shifting said chuck having adjustablestop mechanism for arresting the u ward movement of the chuck inpredetermined position, a retractable clamping head arranged to co-actwith the chuck to hold a pipe in registry with the boring bar and meansfor advancing and retracting said head.

2. A machine having the features of claim 1, having in combinationtherewith pipe supporting tracks for feeding pipes into registry withthe chuck and clamping head and stops for arresting pipes rolling oversaid tracks in approximate registry.

3. A machine having the features of claim 1, having in combinationtherewith pipe supporting tracks for feeding pipes into registry withthe chuck and clamping head, stops for arresting pipes rolling over saidtracks in approximate registry and means for lifting the pipes over thestops.

4. A machine having the features of claim 1, having in combinationtherewith pipe supporting tracks for feeding pipes into registry withthe chuck and clamping head, stops for arresting pipes rolling over saidtracks in approximate registry and means for lifting the pipes over thestops consisting of lifting levers pivoted below the tracks and adaptedto form an inclined support for the pipes when turned upward.

DAVID GILES.

